Process and apparatus for producing and reading arabic numbers on a record sheet



Sept. 8, 1970 w. J. BIJLEVELD ET AL PROCESS AND APPARATUS FOR PRODUCINGAND READING ARABIC NUMBERS ON A RECORD SHEET Filed Sept. 3, 1965 4shets-sheet 1 EERSTE Cim TWEEDE CIJFER i VIE D CIJFER VL: DE cum ZEVENDECIJFER FIG. I

ERSTE C DERDE CIJF ER VIERD CIJ FER L1 EDE CIJFER FIG. 2

HONDERDGULDEN TIENTJES CENTEN HONDERD GLLD TIENTJES DUBBELTJES CENTENFIG. 4

INVENTORS W. BIJLEVELD ATTORNEY VAN DER TOORN Sept. 8, 1970 w. J.BIJLEvr-:LD ET AL 3,527,927

PROCESS AND APPARATUS FOR PRODUCING AND READING ARABIC NUMBERS ON ARECORD SHEET Filed Sept. 5, 1965 4 Sheets-Sheet 2 GULDENl UBBELTJEsCENTE' Hf f.

*.7 x z l GULDENS m FIG. 5

INVENTORS f W. J, BTJLEVELD A. J. VAN DER TOORN BY ATTORNEY Sept. 8,1970 w. .LBIJLEVELD ET AL 3,527,927

PROCESS AND APPARATUS FOR PRODUCING AND READING ARABIC NUMBERS ON `ARECORD SHEET F1160. Sept. 5, 1965 4 Sheets-Sheet 4 Fam I sI-IEET EDGE FcD Y DETECTING PHoTocELLs Fbl] 1 n m l! I 1234512345123l|51235123l5;READINGSTATION tyIIIIlIIIIIIIIIIIIIIIIII I PHoTocELLs S i..

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INVENTORS w. J. BIJLEVELD A. J. VAN DER TooRN ATTORNEY United StatesPatent O U.S. Cl. 23S-61.11 1 Claim ABSTRACT OF THE DISCLOSURE A processfor producing a visually readable, rectangular record sheet or card withhorizontal code eld strips of prearranged visual rectangular areas eachof which areas indicate in three horizontal rows in only visuallyreadable printing: (a) all ten Arabic digits in different predeterminedpositions therein and (b) the digital loca- 'tion for that digit. Thesestrips of rectangular areas are arranged so that they can be easilymarked with both visually and machine readable digits over the printedindications by any person in his or her natural left to right sequenceof writing Arabic numbers, with the position of that persons marks ineach rectangular area making the sheet then machine readable.

An apparatus including an electronic circuit for reading these markscomprises a first plurality of horizontal scanning devices with onedevice for each digit indication in two of the horizontal rows; and asecond plurality of vertical scanning devices, with one device for eachrow of indications, which vertical devices successively scan the edge ofthe card parallel to these rows as the card moves past them. The circuitalso includes AND-gates controlled by more than one of the firstplurality of horizontal scanning devices to be responsive to the digitlocation or position marking in the third row of each code field stripon the card.

BACKGROUND OF THE INVENTION The invention relates to a record sheet theface of which is provided with a number of horizontally aligned figurerecording tracks pre-printed in a visually perceptible but not machinedetectable contrast, each of which tracks consists of three equally longcontiguous horizontal subtracks placed below each other. Two of thesesub-tracks, hereinafter referred to as figure sub-tracks, are dividedinto five aligned boxes, each of these ten boxes being preprinted withone of the Arabic figures from to 9 in a visually perceptible but notmachine detectable contrast and intended for recording per track onevisually as well as machine readable handwritten ligure corresponding tothe figure pre-printed in the relevant box, the recorded guresconstituting the visually readable number being at the same orapproximately the same level. The third subtrack, hereinafter referredto as additional sub-track, which is preferably located between the twofigure sub-tracks, is

3,527,927 Patented Sept. 8, 1970 lCe intended for marking an indication,pre-printed in the additional sub-track, concerning the nature of thefigures to be recorded, as e.g. the order of the figures in a number, ora unit in which the figure to be recorded is expressed, if not all thepairs of figure sub-tracks are used for recording the numerical datum,such as a number or amount, which indication, if marked, e.g. bystriking out, acts as a visually perceptible as well as machinedetectable additional mark, so that the recorded numerical datum,together with the additional mark recorded in the additional sub-trackexhibits self-checking and errorpreventing properties, while therecording can easily be effected in the normal sequence and the normaldirection from left to right.

Vertical code fields consisting of a plurality of vertical markingcolumns placed beside each other and each cornprising ten verticallyaligned marking positions are wellknown.

ln each column the figures 0 to 9 are pre-printed in the respectivemarking positions. Recording a number is done by applying a machinedetectable mark to one marking position in each column. The place of amarking column indicates which denomination of the number is recorded init; the digit value of each domination depends on the position of themark in the marking column. The extreme right marking column is intendedfor the units, the adjacent column at the left of it for the tens, thenext column toward the left for the hundreds, and so on. So each markingcolumn of such a vertical code field is intended for a specified powerof 10.

This arrangement of the code field urges the writer to record thefigures from the right to the left, which is against the normaldirection of writing. Only if the number of figures of the numericaldatum to be recorded is equal to the number of marking columns, can therecording be effected from the left to the right without specialprecautions.

The scanning-technique frequently requires, for the sake of areliability check on the scanning, that all the marking columns aremarked, particularly in the case when the number of significant digitsof a numerical datum is smaller than the number of marking columns. Inpractice this inequality often occurs, e.g. when amounts have to berecorded or numbers of a historically growing series. Thus e.g. thenumber of figures of postal account numbers varies from one to seven. Ifthe writer has to record a number consisting of a number of figuressmaller than the number of marking columns of a code field, he has rstto nd out the number of digits of the number to be recorded, next he hasto look for the number of marking columns in the Vertical code lield orhow many figures recording tracks is in a horizontal code field, then hehas to ascertain the difference between these two numbers and to countout this dilerence, and then he can proceed to mark the lirstsignificant digit of the numerical datum in the proper column or trackand to mark the digit zero in the columns or tracks that are not used.Experiments have shown that in the case where numerical data consistingof different numbers of digits have to be recorded in succession,shifting errors frequently occur. Moreover this ever recurring necessityof calculating in which column or track the first significant gure of anumber has to be recorded, or the unnatural recording from right to leftprovokes a permanent psychological resistance against the use of codefields for recording numbers.

Thus, the placing of marks in the zero positions at the left before thesignificant digits, is at variance with the normal Way of writingnumbers. The necessity is not seen by a major part of a heterogeneouspublic, as e.g. transfer account customers, which causes in many caseseither the omission of these zeros or the recording of figures in` wrongcolumns, as experiments have shown; and this seemingly superfluous workprovokes a psychological resistance as well.

In the code fields so far known, it is undesirable to Start recordingthe numbers from the left to the right, starting in the extreme leftcolumn or track and, if the numerical datum consists of a number ofdigits smaller than the number of columns or tracks, to mark the zeropositions in the remaining columns or tracks, because in that manner adifferent existing number is recorded, which is ten times or a power often times larger than the number intended to be recorded.

It is to be observed that a code field comprising a plurality ofhorizontal figure recording tracks, each consisting of two figuresub-tracks placed one lbelow the other is known from the British patentspecification 817,902, FIG. 2, with regard to which the followingremarks can lbe made:

The recording and scanning of figures, for example, the figure 6,requires four sub-tracks, namely two figure sub-tracks and 12) and twosignal sub-tracks (11 and 13). A uniform vertical dash is used to markthe signal tracks; and it is placed in the signal track 13 n case of aneven figure and in track 11 in the case of an odd figure. Thus thewriter can easily make a mistake by placing a mark indicating an evenfigure in the signal track 11 instead of in the signal track 13.

In the code field according to this British patent specification, noindications are given as to the denominations of the figures in thenumber. This, as experiments have shown, easily leads to shiftingerrors, if the number of figures to be filled in is smaller than thenumber of tracks.

A further disadvantage of the code field in this British patentspecification is the use of a uniform signal mark (a vertical dash)which according to the example in its FIG. 2 will not be able to be readat one glance by the general public and thus is a serious difficulty forits general use. Furthermore there is no proprio-ceptoric muscle controlwhen the writer makes these uniform marks in the proper places for thedifferent figures, and if a vertical dash is placed in the wrongposition a third person cannot ascertain from the recorded informationthat a mistake has been made nor what has been the writers intention inthat the vertical mark isnot a reproduction of the number or figure'which the marker wishes to record. This also is a serious drawback forlarge scale accounting systems as in clearing house services, in thatsuch an error could only be found out if the information were recordedin the Arabic figures elsewhere on the information bearer, card or form.

A still further disadvantage of the code field according to this Britishpatent specification consists in that it does not contain anyinformation concerning the nature of the figures to be recorded, as forexample the order of the figures, nor any protection against undesirableadditions in case fewer figures have been inscribed than the codel fieldcan record.

SUMMARY OF THE INVENTION This invention relates to an information beareror record sheet, the face of which is provided with a plurality ofhorizontally aligned figure recording tracks preprinted in a visuallyperceptible but not machine detectable contrast, each of which tracksconsists of (a) three equally long contiguous horizontal sub-tracks orrows placed successively one below the other and (b) equally spacedvertical lines dividing these rows or each track into rectangular areas,one corresponding to each digit or figure of the longest number to bewritten or marked therein. Two of these rows or sub-tracks, hereinafterreferred to as figure sub-tracks, are divided into five aligned boxes,each of these ten boxes being pre-printed with one of the Arabic figuresfrom 0 to 9 in a visually perceptible and at substantially the sameinsensitivity level, but not machine detectable contrast. Thesepre-printed boxes are intended for recording one visually as well asmachine readable handwritten figure or digit per track, corresponding tothe figure pre-printed in the relative box. The third row or sub-track,hereinafter referred to as the additional sub-track, preferably islocated between the two figure sub-tracks, and is intended for markingin each rectangular area an indication, preprinted in the additionalsub-track, concerning the nature of the figures to 'be recorded, such asfor example the order or location of the figures or digits in a number,or the unit in which the figure to be recorded is expressed, such asfirst digit, second digit, third digit, etc. Also if not all of therectangular areas are used for recording the numerical datum, theindication in the additional sub-track of the unused rectangular area orareas, if marked by striking it out, acts as a visually perceptible aswell as a machine detectable additional mark which exhibitsself-checking and error-preventing properties that can easily beeffected in the normal sequence and the normal direction of writing fromleft to right.

Furthermore, the sheet has an edge parallel to the horizontally alignedrows or tracks, which edge is machine detectable for determining whichrow or sub-track is being read by the mark scanning devices.

Thus the apparatus of this invention includes the information bearer orsheet as a part thereof, as well as a first row of scanning devicescorresponding in spacing to each of the spaced boxes along thehorizontal figure sub-tracks to respond only to the marks writtentherein, and a second row of scanning devices perpendicular to the firstrow of scanning devices corresponding in spacing to each of the parallelrows or sub-tracks in each of the code field strips on the informationbearer, sheet, or card. The outputs of all of the scanning devices areconnected together in an AND-gate matrix for recording which position ineach row has been marked, which position corresponds to the number to berecorded. Regarding the scanning of the additional sub-track, at leasttwo of the horizontal row scanning devices are connected to anotherseries of AND-gates for the sole detection of marks in this addiitonalsub-track, which marks must be long enough to simultaneously energize atleast three adjacent scanning devices, so that in the event a personwrites a figure in one of the figure sub-tracks which crosses theadditional sub-track it will not be detected for a position indicationor mark in the additional sub-track.

OBJECTS AND ADVANTAGES The record sheet provided with code fieldsaccording to the invention is free from the above-mentioned prior artdisadvantages and in addition exhibits the advantages that it can befilled in by a heterogeneous public more easily and more accurately inthe natural writing direction from left to right, that is, to beginwriting in the first extreme left track, and that it allows of a machinecheck as to whether in each track only one and not more than one machinedetectable figure or additional mark has been recorded.

In comparison with the code field according to the above mentionedBritish patent specification 817,902, the figure sub-tracks and theassociated signal sub-tracks in the code field of the present inventionhave been combined into two figure sub-tracks, so that the scanning andreading of the figures requires only two instead of four sub-tracks.Also applicants figures are pre-printed in a visually perceptible butnot machine detectable color and ink in boxes acting at the same time asmarking positions for the recording of a visually as well as machinereadable iigure corresponding to the ligure pre-pritned in the box. Thusan error of mistaking one track for another as in said British patent isprevented, and the number itself is recorded in the code field which canbe read at one glance by the general public. Thus if the writer recordsan otherwise correct ligure in the wrong box not corresponding to thisfigure, the machine reads an erroneous number it is true, but the visualcheck carried out by an operating staff will reveal the writersintention, supposing the shape of the ligure primarily renders thisintention due to the writers proprio-ceptoric muscle control to expressthis intention. Thus a double recording for checking purposes can bedispensed with if a record sheet according to the present invention isused.

Furthermore the code iield of this invention contains provisions againstfraudulent additions of one or more digits to a number which, as regardsthe number of digits, is smaller than the capacity of the code lieldstrip. This is done Iby cancelling out the words in the additionalsubtrack in the rectangular areas in which no figures have. to berecorded. This cancellation thus acts visually as well as being machinedetectable, so that an automatic one out of eleven check device for eachrectangular area in the code lield can be operated by the scanningdevices in the machine or apparatus.

BRIEF DESCRIPTION OF THE VIEWS The above mentioned and other features,objects, and advantages, and a manner of attaining them are describedmore specifically below by reference to an embodiment of this inventionshown in the accompanying drawings, wherein:

FIG. 1 shows one type of code field or strip marked with the visuallyperceivable but not machine detectable digits and digit positions inthree horizontal rows or subtracks according to the present invention;

FIG. 2 is a view of the code strip shown in FIG. 1 marked in accordancewith the process of this invention with a specific number of digits lessthan there are rectangular areas for the digits;

FIG. 3 is a code strip according to this invention indicated innumerical amounts of Netherlands guilders and cents;

FIG. 4 is a code strip according to FIG. 3 marked for seventy-three (73) cents according to the process of this invention;

FIG. 5 discloses three code strips similar to that shown in FIG. 3 inwhich 16 guldens and no cents is marked in three different manners, allof which are detectable similarly lby the apparatus of this invention;

FIG. 6 is a sample of a Netherlands post check card embodying two codestrips according to this invention, one for the post check number of theparty to whom payment is to be made, and the other for the amount to bepaid to that party;

FIG. 7 is a schematic diagram of a portion of a card with a code stripaccording to this invention passing by two rows of scanning devices, onea horizontal row for each digit box in each row or ligure sub-track, andthe other a vertical row for sensing each horizontal row on the card;and

FIG. 8 is a schematic block wiring diagram of a matrix of AND-gatescontrolled by the vertical and horizontal rows of scanning devices shownin FIG. 7.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT (I) The process ofproducing a record sheet FIG. 1 exemplies a horizontal code fieldconsisting of seven ligure recording tracks, in which a number, e.g. atransfer account number, consisting of seven digits or fewer can berecorded. If in this example the number consists of seven digits, onebox, pre-printed with the relevant ligure, is lilled in in each of theseven tracks. If in this example the number consists of six digits orfewer, these digits are recorded from the left on in the respectivetracks, notably in the boxes pre-printed with the relevant digits. Inthe tracks in which no digit is recorded, the words pre-printed in the"additional subtrack are lined through (see FIG. 2). This cancellationis carried out in a visually perceptible as well as machine detectablecontrast and acts as an additional mark that does not change the valueof the recorded ligure, after which the recorded number is self-checkingwhen scanned, because in each track one mark must occur in one of theeleven possible marking positions, i.e. either as a ligure in one of theten ligure boxes occurring in the two ligure sub-tracks or as ahorizontal dash, or the additional mark in the additional sub-track.

The ladditional mark in the shape of a horizontal dash is as long or atleast practically as long as the cancelled words pre-printed in theadditional sub-track, so that it can be detected in the machine by onlya plurality of horizontal scannings. Thus a short accidental contrastbetween the two ligure sub-tracks, caused by a too long stroke of aligure inscribed in one of the ligure sub-tracks can be distinguishedfrom lan additional mark, because the length of an excessively longstroke seldom exceeds the width of a ligure box, while in practice anadditional mark is always longer than twice the width of a box.

FIG. 2 exemplifies a horizontal code ield designed according to theinvention, consisting of seven ligure recording tracks. in which thenumber 16435 has been recorded in such a manner that the down-stroke ofthe ligures 1, 3 and 5 and the up-stroke of the ligure 6 have been drawnthrough the additional sub-track, while additional marks have beenplaced in the sixth and the seventh track.

The code field according to the invention is quite suited for recordingamounts in visually easily readable as Well as machine detectablefigures, in such a manner that the total image of the recorder numbercan be read at one glance by a heterogeneous public, e.g. transferaccount customers.

FIG. 3 exemplifies a code field for recording amounts to a maximum of fl999.99. For that purpose the code iield of this example is divided intolive figure recording tracks, in each of which the additional sub-trackbetween the two figure sub-tracks contains an indication, notably fromthe left to the right hundered gulden (hundred guilders), tientjes (tenguilders), guldens (guilders), dubbeltjes (ten cents), centen (cents).

(a) Il the recorded amount is larger than f1 9.99 but smaller than f1100.-, an additional mark is placed through the words hondered gulden.

(b) lf the recorded amount is larger than f1 0.99 but smaller than f110.-, additional marks are placed through the words hondered gulden entientjes (c) If the recorder amount is larger than f1 0.09 but smallerthan f1., additional marks are placed through the words hondered gulden,tientjes en guldens If desired the writer can confine himself torecording one additional mark, notable in case (b) through the wordtientjes and in case (c) through the word guldens, because in such acase the additional mark constitutes a maximum-restriction mark allowingfor a machine check as to whether in the machine reading amount readequals the amount indicated in the tracks at the right of the additionalmark, notwithstanding the addition of one or more ligure, blocks orrectangular areas in the tracks at the left of the additional mark (FIG.4).

If the amount consists of whole guilders, the tracks for dubbeltjes andcenten may be marked either by inscribing a 0 in the zero boxes or bydrawing additional marks through the words dubbeltjes and centen in theanalogy of the common practice of Writing a dash after the decimal pointin round amounts.

FIG. exemplifies how, according to the invention, an amount of jl 16.-can be recorded in three manners Without losing its self-checkingproperties.

(II) A record sheet The machine sending and checking of data recorded incode fields on record sheets according to the invention will bedescribed hereinafter.

FIG. 6 exemplifies a practical embodiment of a record sheet according tothe invention in the shape of a transfer card on which the transferaccount customer records the account number of the payee and the acountto be transferred in the figure recording tracks, boxes, and rectangularareas of code field strips in a manner as described above according tothe invention.

(III) The apparatus The following figures exemplify a device for theautomatic handling of data recorded on record sheets.

FIG. 7 shows a part of the record sheet R having two figures and oneadditional sub-tracks. The record sheet R is moved by pusher means M ata uniform speed in the direction of the arrow shown. During thistransport, the information recorded on the record sheet R can be scannedby means of photo-electric cells located in the reading station S.During the scanning period the sheet edge detecting photocells Fa, Fb,Fc and Fd are successively covered by the record sheet R. As soon as thetop edge of the record sheet R covers the photocell Fa, the upper limita of the figure recording tracks are just under the photoocells I1through V5 of the reading station S. In the arrangement shown thescanning of each figure recording track requires five photocells. Thusthe first figure is read by the photocells I1 to I5, the second figureby the photocells III to IIS, etc. When the record sheet R moves on, thelimit b reaches the photocells of the scanning staiton, when thephotocell Fb in the transport path is covered by the top edge of therecord sheet.

Similarly the lower part of the figure recording tracks will be scannedwhen the cell Fc has and the cell Fd has not yet been covered by thesheet R.

The photocells I1 through V5 of the reading station S can be Connectedto a circuit as shown in FIG. 8. This circuit is intended for handlingand recording only one figure or major rectangular area from only onefigure recording track. An identical circuit is used for each of theohter figures or rectangular areas. The output terminals of thephotocells I1 to I5 are connected to the input terminals of theamplifiers V1 to V5. The output terminal of the AND-gate P11 is positivewhen only the photocell Fa (FIG. 7) is covered. Therefore the outputterminals of the photocells Fa to Fd are connected via amplifiers totriggers not shown. The output terminals of these triggers are connectedto logic circuits comprising the AND-gates P11, P12 and P13 which haveinputs marked according to those photocells from which theircorresponding two trigger output terminals are indicated with andwithout primes.

The output terminal of the amplifier V6 is connected to the inputterminals of the AND-gates P1 to P5. If e.g. during the time when theoutput terminal of V6 is positive the photocell I1 detects a marked boxon a record sheet R, there appears a positive pulse at the outputterminal of the amplifier V1. At that time the output terminal of theAND-gate P1 is positive too, so that the trigger T1 is changed over. Inan identical manner one of the triggers T1 to T5 can be changed over forone of the boxes 1 through 5 filled in with the first figure or numberon the record sheet.

The lower part of the track is scanned by the reading station S duringthe time when the photocells Fa to Fc are covered. During that time theAND-gatel P12 is positive. The output terminal of the amplifier V7 isconnected to the AND-gates P6 to P10. If a figure appears in one of theboxes 6 through 0 one of the corresponding triggers T6 to T10 is changedover.

The sub-track enclosed by the limits b and c under the reading stations,when the photocells Fa and Fb are covered. During that time the outputterminal of the AND-gate P13 as well as that of the amplifier V8 canbecome positive. This output terminal becomes positive if the outputterminal of the amplifier V3 becomes p0sitive during the scanning of theadditional sub-track via conductor V3. Thus horizontal line marked inthe additional sub-track is only significant, when three or moreadjacent photocells detect this line. If such a line is detected thetrigger T11 is changed over. This must happen if one of the followingcombinations of output terminals of the amplifiers V1 to V5 arepositive: V1, V2, V3 or V2, V3, V4 or V3, V4, V5. The result is that inthe circuit the output terminals of the AND-gates P14 o1 P15 or P16become positive. The trigger T11 is changed over then by means of theOR-gate P17.

By means of the circuit of FIG. 8 the significant information of therecord sheet R can be recorded in a number of triggers T1 through T11,etc. It is clear that the circuit can be completed with well-knownchecking circuits, e.g.: only one box may be filled in, etc.

The record sheet can also be moved on in a horizontal direction. In thatcase the reading station need only to contain three photocells, butprovisions must be made then for horizontal synchronization.

While there is described above the principles of this invention inconnection with specific apparatus, it is to be clearly understood thatthis description is made only by Way of example and not as a limitationto the scope of this invention.

We claim:

1. An apparatus comprising:

(a) an information bearer having:

(l) an edge,

(2) a plurality of tracks (ab, bc, cd) parallel to said edge,

(3) visually readable symbols in predetermined equally spaced locationsalong each of said tracks with one of said tracks (bc) having symbolsextending over a distance in said one track of more than one of theadjacent locations in the other tracks (ab, cd), and

(4) visually readable marks in some of said locations detectable by saidmachine,

(b) a first row of scanning devices (S) corresponding in spacing to eachof said equally spaced locations along said other tracks and responsiveto said marks on said bearer,

(c) a second row of scanning devices (Fa-Fc) perpendicular to said firstrow of scanning devices and corresponding to the spacing of saidparallel tracks and responsive to said edge of said bearer,

(d) means (M) for moving said bearer along said second row of saidscanning devices and transverse of said first row of said scanningdevices,

(e) first and second rows of AND-gate means P1- P5, P6-P10 correspondingand connected to each scanning device in said first row of scanningdev1ces,

(f) first, second, and third AND-gates (P11, P12, P13), connected to thescanning devices of said second row of scanning devices, said first andsecond AND-gates being connected to said first and second rows ofAND-gate means, respectively, and being operated by detection of marksin said locations in said other tracks (ab, cd), and

(g) a third row of AND-gate means (P14-P16) connected to said thirdAND-gate and to predetermined different adjacent pluralities of saidscanning devices in said first row of scanning devices, said third rowof AND-gate means being operated by extend over more than one of saidadjacent 1ocations.

References Cited UNITED STATES PATENTS Betts 23S-61.603

Rauch 23S-61.12 X

Tarasuk 23S-61.12 Woodland.

Mink.

Quinn et al. 23S-61.12 Bailey et a1. 235--61.12

DARYL W. COOK,

10 Street.

Johnson 23S-61.603

Luhn 235-61.115 Kolanowski et al. 340-146.?,

Haritono 235-61.603

Atkinson 23S- 61.603

Primary Examiner R. M. KILGORE, Assistant Examiner U.S. C1. X.R.

(Our ReLWP 169'7'13,

ggo [JN-[TED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No.3,527,927 Dated Sept. 8, 1970 Inventor(s) W. J. BIJLEVELD et al It iscertified that error appears in the above-identified patent and thatsaid Letters Patent are hereby corrected as shown below:

Column 6, line 21, "Scannngs" should read Scanners line 39, "recorder"Should read recorded line 47, "hundred" (first occurrence) should readhonderd line 57, "recorder" should read recorded --5 line 58, "f1.,"should read fl1., line 6l, "notable" should read notably line 65, before"amount" insert the Column 7, line 11, "acount" should read amount; line37, "staton" should read station line 47, "ohter" should read otherColumn 8, line 4, "stations" should read statonS line l0, "V3" shouldread V3 SGW ANU LI in M970 (SEAL) Attest:

EdwardMFletcher r.

I mm E. suumm, JR.

I Attesling Offl Gomssioxmlof Patente J

